Knife for leather-skiving machines.



A. M. ALEXANDER.

KNIFE FOR LEATHER SKIVING MACHINES.

APPLICATION FILED 001". 16, 1909.

' Patented Oct. 28, 1913.

l wu 1 wwwzzwxw 6 n l l l l l l I l I 1 l l \llllllillllllllllllll L above referred to, the present invention also "UNITED STATES PATENT orni'on.

ALEXANDER M. ALEXANDER, OF BEVERLY,

MASSACHUSETTS, ASSIGNOR T0 UNITED NEW JERSEY.

I Specification of Letters re cent.

KNIFE FOR LEATHER-SKI VI NG innonmns.

Patented Oct. 28, 1913.

Application filed October 16, 1909. Serial No. 522,905.

To all whom it may concern:

Be it known that I, ALEXANDER MQ" ALEXANDER, a citizen of the United States, residing at Beverly, in the county of Essex and State of' Massachusetts, have invented certain new and useful Improvements in Knives for lieather-Skiving Machines; and I do hereby declare the following to be a full, clear, and exact dcscriptionofthe invention, such as Will enable others skilled in the art to which it appertains to'make and use the same.

This invention relates to a cylindrical knife adapted for use in leather skiving and other machines.

The object of the invention isto provide the blade of which may an improved knife, be readily adjusted occasioned by grinding the same, readily removed and replaced blade when worn out.

3 With this object in view a feature of the inventionv contemplates the provision of a holder for exterior-1y supporting the blade to give it the required rigidity, and means for moving the blade axially of the holder to enable the blade to be accurately and readily adjusted. Y A further feature of the invention contemplates the provision of a holder for exteriorly supporting the blade, means for moving the blade axially of the holder, and means for clamping the blade against the holder to securely hold the blade in position and insure a true cylindrical blade.

' In addition'to the features of invention to compensate for wear or may be by a new consists of certain novel features of construction and arrangement of parts hereinafter described and claimed, all of which will be obvious to those skilled inthe art from the following description.

The several features of the invention will be clearly understood from an inspection of the accompanying drawing, in which- Figure l is a front elevation of the knife, and Fig. 2 is a sectional elevation of the same with parts broken away.

As shown in the drawings, the blade 1 of the knife is formed from a thin fiat band of isteel which is bent into the shape of a cylsh inder, and has one edge sharpened. For

thepurpose of adjusting the blade aauaily, a ring 3 is provided which is recessed at its outer edge to receive the. blade. The ad justing ring 3 is preferably provided with pins which are received in bayonet slots 5 formed in the inner edge of the blade. In the present instance three slots are provided, one adjacent each end of the blade strip and one midway of its length. By this construction the blade 1 may be readily attached to and detached from the ring 3, and this ring acts as a carrier whereby the blade may be adjusted inwardly as well as outwardly, although it will be understood that a ring or other suitable means may be employed which merely operates to move the blade outwardly. The ring 3 is interiorly threaded to fit the threaded exterior of a head 8 which is, secured by bolts. 9 to a flange '10 formed on the shaft 12. The blade 1 is supported exteriorly by a cylindrical cup-shaped holder 14 which is rotatably mounted upon the inner reduced portion of the head 8 and also fits the external periphery of the adjusting ring 3.

It is desirable to support the blade-interiorly and clamp it'in adjusted position against the interior of the holder 14 to produce a true cylindrical blade and hold it firmly in place while being rotated at a high rate of speed. This is accomplished by a clampingv ring 16 mounted to rotate about the outer end of the head 8 and provided with a series of radial/slots 17 extending from its periphery towan'd the center to divide the ring into a corresponding number of yielding sectors 18. of the ring 16 is concave and operates to eject loose chips and. dust under centrifugal action, thus keeping the interior of the knife free from chips. Bolts 20 pass thrdugh the holder 14: and adjusting ring 3 and are threaded into the sectojgs 18. Thus the holder, adjusting ring, and clamping ring 16 are held against relative rbthtion and by tightening thebolts 20 the holder and clamping ring are clamped against the head 8, and the sectors l8 are sprung outwardly against the interior of the blade 1 to clamp the latter against the holder.

For adjusting the blade, vthe bolts 20 are unscrewed sufficiently to free the blade from the clamping ring and enable the holder and clamping ring to be rotated about the head 8. Then by holding the shaft 12 stationary The outersurface 19 and rotatinn the holder,adjust ing ring and clamping ring, the adjusting ring and the blade are moved-axially of the hnlrlerby the clamping ring is removed from the interior threaded engagement of the adjusting ring with the head 8. After the blade has been thus adjusted the bolts are tightened to clamp theholder upon the head and the b ade within the holder.

To remove the worn out blade and replace it with a new blade, the screws 20 are removed from the clamping ring 16 and the of the holder. The adjusting ring is then unscrewed from the head 8 and the blade'l removed from this ring. A new blade is then slipped on the ring 3 with the pins 4 entering the bayonet slots 5, the ring is then screwed on to the head 8, and thereupon the clamping ring is placed upon the head and clamped in position. by the bolts 20.

Although the blade is shown and described as formed from a fiat band of steel bent in the shape of the cylinder and retained in this shape by the holder 14, it will be understood that the blade may be formed of an integral cylindrical shell.

The invention having been described, what is claimed is 1. A knife for skiving machines, having, in combination, a cylindrical blade, -a cylindrical holder within which the blade fits, an interior supporting ring-fitting within the blade, a head upon which the holder and ring are rotatably mounted, an adjusting ring engaging a. screw-thread on the head, and devices for securing the holder, rings and head against relative rotation, substantially as described.

A knife for skiving machines, having, in combination, a cylindrical blade, a cylindrical holder within which the blade fits, an interior supporting ring slotted to form e-X- pansible sectors, means for effecting axial adjustment of the blade relatively to both holder and-ring, and devices for springing the sectors outward to clamp the blade;

drical holder within which the blade fits, a

clamping ring 'fit-ting within the blade and slotted to form sectors, a blade adjusting ring within the holder back of the clamping ring, bolts connecting the'holder and clamping ring and passing through the adjusting ring, a head on which the holder and clamping ring are rotatably mounted, provided with a screw-thread engaged by a screw-thread within the adjusting ring, substantially as described. t

5. A knife for a leather skiving machine, having, in combination, a holder, a blade, and means for'clamping the blade to the holder so shaped as to eject the chips through the front of the knife, substantially as described. p

6. A knife for skiving machines, having, in combination, a knife blade, anadjustable knife carrier to which the knife blade is de tachably connected, a plurality of re taining members on opposite sides of the blade for retaining the blade on the carrier, and means for moving the carrier relatively to the retaining members to adjust the blade as the blade is worn away.

ALEXANDER M. ALEXANDER.

.lVitnesses \VARREN G. OGDEN, N. D. MCPHAIL.

Qopies 01 this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

